

import math
import random
from arcade.clock import GLOBAL_CLOCK

if __name__=='__main__':

    print(math.cos(0)) 
    print(math.cos(1))
    print(math.cos(math.pi/2)) # 约等于0


    matrix=[
        [1,2,3],
        [4,5,6],
        [7,8,9]
    ]
    del matrix[1]
    print(matrix)

    # 随机打散方法
    arr=list(range(10))
    p1=arr.pop()
    print(p1)
    random.shuffle(arr)
    print(arr)

    print(GLOBAL_CLOCK.ticks)